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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f878762bfc741bbccfaf904d7b551a30e51f9e279d389723f1c0542e25e28fd' 
  AND token = 'FnGjMyr/f0jk2uOscxR1cCieO0xaVLBr9a4J2XOq3mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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