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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac89955b506e1ce08c39801daa5cf7be25e3106004d45896d8485a20751734d' 
  AND token = 'rGv9lQAx+LmAAZ8vtONbwWfxvWcqMj5N5URmp3ULNVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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