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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa9b52820f0dd89fd218995ad6b0bb338d15d5040b1dc4454c89654b0d752b9' 
  AND token = 'H0g8cuOhori7diyUCKOyeHCPREDuPHIENY/yl2x7Ncw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}