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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c96143d4998911b2b918412557928304b8dc98943fa861c500add9313be4cfe' 
  AND token = 'BapdHZ7MwD3Ks5kKIa5K5TqxZ2Kk5/GpNy8kdJS/MNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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