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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4912cef19d5246cc61f5bb52c12e148502d050758730fb9e415fe06ec8d2e234' 
  AND token = 'Y7nbRlnPqB4U1SkaEMA0ELY2bMnTJfTVrrizRxCXgeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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