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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea97c24d5cd948f7ac3d2358945536ff4e94e552a650b109b08091bb974d90f2' 
  AND token = 'PB7byWnSsHlbF5VECqTulxX2OP/F6AQCmn4lmx6sDfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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