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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0496fee5d1cbedcbbcb5cd05335e2cf18625c3636313b45e84dd370124d2a787' 
  AND token = 'bDsX/0yaRwFjfxlmfQR2wszec/Mu0rbRqwWeEM8RTPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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