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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd839109896819dbc3818158d44ea4e07306069f5253c874b9859880be751be' 
  AND token = 'dA1vm/lc5j+rAFa8SSmjvzDMASiQtiaGmjy8E5xoACo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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