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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90690917bbbc1bb564f51cf657bf437a9967703185b24fe0f814efed92140784' 
  AND token = 'rAzkdfCmVcT2TahgoEGuzE578cSHKGJpja0r/9PUa3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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