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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea23aec92e3a40a572c7d1f846c6f045eb811ad9157118ddfa536c2c3abbe782' 
  AND token = 'iPpyOjzQNERolCQqJ42LEXl0u3dC97ijKFlHiMvu0Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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