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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8bf6077a0a09fa0d799eb9b169ed019dd234c6c10d2a861b968db36ac690e7' 
  AND token = 'mOplsUOausrRPqNaMoW52rKdXeyF2e+fHZwJjv7wh88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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