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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2e3a165ffffdd50cc1b4a1694f869404901dda6142d3c4200baea4a6b22acc' 
  AND token = 'gk2Pi4sS5WwG1DgMn34nUWib9pjYumrFErNOqCJkz/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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