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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56295fe714a6e7f6601968e3c1572424b56b991e0a61e7db0d621a9bfcb85aa3' 
  AND token = 'm88gDmrCrJR+affz5EXfTbq/BzH8yyI8ZyClMmta2bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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