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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63193111b9abceac4850d6c7cf0076b16190f2b5992fc8d134412af065f199f2' 
  AND token = '4ApYPfcx5keO/u/3321TEiFB+CBAON/qHN91VctQFeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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