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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bbacf4b9de5c80d834411b4ac1c8de4c00cd1c18864b990abd1906d99879c9' 
  AND token = 'gAF6oALXeGb+lSMCnver69hfY0qDxFTCg9QR7VDhV3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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