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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefccc529fa0db6c1f3d774fdb8a2af5d5dea6187e930d7b58b0b7fd30c243e5' 
  AND token = 'pSQUvZrf5tN7gHUpkZYsZ6uttLaHfV8fIKgUP5AdLLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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