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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9925e242b72376d1de0860dd96b749338e16ea2ea724571a86a593f0c98b51f7' 
  AND token = 'ky/7sbimHqFa/Su8feVklM38ra3o0okoQISr4z3Y7XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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