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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0feb1c149bba73eadfa04c8d732a302aaa6eb3b5138655b9301b13ca2de97ef' 
  AND token = '6CuvJrlFAXLMOHEWTlx91oNu1cBoAB3uk6P/rz2R1ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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