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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75797e839387d8438e25798c3ef6ce2f0dda74785972d937601ca86f7e700ec6' 
  AND token = 'A1lu1J1o6gt+iAcQw32teHg0c9QfyloA085kL6kvsOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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