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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8e4d8a959aa76001435220143a85da40aa1a3b256e7d6c2aae5a5a135e747b' 
  AND token = 'LFCT3sJDiSM6koWpuJ3/miWH7og1dAxjhA+Dteg2e4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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