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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0e6f7eb21bbd1c6855bc8622115f1ab3414938da75e974a4a74d580463fb04' 
  AND token = '/1stnYU2gtuetJI5MneXoNtzpzL4npF8ifHdk7DKT1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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