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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec444fa8abf49cd5be896e33481a600ca0f6ce5eed3b5d3b3dfc85c9fafff11e' 
  AND token = 'ZEO62APiGjT/JxaVYdqZOMjay6Rh4qac5R9X5ACt+Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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