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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a03936c30b46ca901b13d604c4cfaa27af6c286237afd7b84e158a8257b1f54' 
  AND token = 'IHVjrLcb3b0CV0q2yt8sRBFEYGvXyByg3px7YyszkJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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