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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3570434b0ab26bc2d5353e82053335c02bf5229b46d45abd934a2ba0e1e5ff06' 
  AND token = 'X3PMR97px3g6PuonyKAGpOWUtfJ3i4QBfXSH496q1lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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