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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e98f28107c86571208e2f621f24b42f0bab36e054995c80fef15e266797490b' 
  AND token = 'dkhD4yAYq3owc07qvqr9fBucpEidReLYOi3Y01iI66c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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