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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a13764cb2b319794fb92607e065f4076cc490b2c52989cb67c0ec8b25da27f2' 
  AND token = 'd+KMZutuMdgIjgPT3irI7bsP5lN2akeZ1O36dVTRmwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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