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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c8ad509d808dbd2e93b0e3358148c564950b6b81ce1c3fcb0b9958209e7312' 
  AND token = 'r2fmceDvHyY3B+qjPnkFNR0LhhfLgx4BFkLxPen5vnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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