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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fd08a6a530f3c7b942d5fed8389a9fa6f9fdac782cf43451da43e50037448e' 
  AND token = 'v5qekZi0PlB4q09tWiMjZikbIln6eKAXi0unOsAIX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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