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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d7de790df8eac981ccb152cf188ad68831a67992c40d3ddd79ec5fb2271d3e' 
  AND token = 'iEbjp+Wc47p7kdzbHemGhn2KLaH5VLU8pRRIqOQmcrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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