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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccb589ad19ce891db4419ec64c78283ea741627da5a7984b5a5955bd8bd5d44' 
  AND token = 'vKUsLG36ogtEhoNL5JL3kOIee3RyD+t7mRXr/RKck+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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