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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b934f989c42f4c9bd6dbf7916e84b528c696a550dc2c8ea042d5ee395b9bde' 
  AND token = 'zHGPaxn566bF/iiXxFERqWrxTAXlXbAEVFh3t7mtuTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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