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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ebed41536121e9d843195b389df25c9dd34e8155580315f01a882baac986a7' 
  AND token = '3SBaVacPVNye9WNrJNi/0SGHCj+GDJ7HPISpUVk0pTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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