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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0befe1a61fef7760abc42fc802cc05c260d7214d25c41fad7e35b4d32ebb9e64' 
  AND token = 'usbEgstglWQGYN1wzknmI/mC2wnz3D5/uv1y8Cr5KGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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