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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a2fb330f3f21c8d86e79a51042d3b7cd5647a1aeb6281c90c0681ebfde6d7a' 
  AND token = 'u7RtEQ81IUZ/AT5CVqPiJpb4J6rUF1XUsxk6webQ5b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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