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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbac05dc97969ea145bbd0b394f26eec7f83cd00295aa2feb982141bbd6db114' 
  AND token = 'o+l/H4XgS2bNJXneBaY+F24OpomUlGSda6TyR5mkbJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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