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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1911701fd29b1ae06155e7343dddcd283760f15d04d2c81d5624a7601c7940ff' 
  AND token = 'r/loybexY9J5DCDn2xF714ZFQjSy49L9jsxNREU7pCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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