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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86c4b7ad1f2b042853b666da0666b8008c3e158c894b88c128acbe27c092f03' 
  AND token = 'MmcICDjG0U2a/2eVIlpp4WWsNGPC30RTQI6xbCPDSHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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