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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e170ccdd7fded6b4483695a76cfced793099c1df2f4e00ef80c338f969b2fe' 
  AND token = 'Uq8g+qGIN+r87HMuCh3IctYLACIix2dWMtUB1tOFAWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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