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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcc07d2999b0952c11b81c7f60f8a62309c444a33e2cd083d63831dc32e86aa' 
  AND token = 'j30h7snemahDQsiBFJ+FbQi6spSI/kn2DH/WLc8X5TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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