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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca818faede2d808373639b3899df83bd2cc4f07db1911171593bde597b27c90' 
  AND token = 'KRLpTfL1uuD1s76My8IboYZiEifXl0AlkycH4NUZZX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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