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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc317733cd32542af4273b06538cd19f344dbd67a0be7c2d513e27cafa0a1c52' 
  AND token = 'q7QNW/WFJInsTribwvuUqm2FZAB1Oz9c/Q4MLV0ye3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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