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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8917788da7994a598e31e3e79c07a28dde4368ec585eab4eb14abe9ac406a45' 
  AND token = 'Nhazp+VT5ox3KwyOViyJT7EcVnseTL/YtQS5yhUl3X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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