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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ef496f6e9d1bd8351747d2d66cc56eb65723e2b6e25456f0a0dd3df40243e8' 
  AND token = '4x8i5IOLE1qPS4w0j2i62joGdDvXypJAzmoE+l2cmjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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