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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fb20386a446aecc8cadc98ff6b27f248e7fee7242a7f0adf3b44f300da11cb' 
  AND token = 'C6ijJRO6o4BkO9ZiNLAWY8QsHMDOvca74zo6fx3OiGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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