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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b7f09158df06ef30f9567997483d49b66fbe86deca2086ab75eb3446957518' 
  AND token = '+Skf3OCW3h0dbHvUlwZ0RK4a4WeVyYirpT/Dy9GskWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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