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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abeb83492b2be50f0f0635b3bdda1a5f48fb568333e8ad02afa7dda3485e44f' 
  AND token = 'qvuJBSNdfhU6NkpO96Ep0/nmqvRhA4cvebOCfx0SCeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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