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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b3bb62fe47cae1f5e693b9803c9d4e63dd4890978ee89e3a167aea0e4bb973' 
  AND token = 'EvOC4ax3dBvKIT7UIj8TpVvu5vWxN/NCS8FQz0r8L88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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